/************************************************************************//**
* @file wiring_buffer.c
*
* @version 1.0.0
*
* @author RedBearLab
*
* @date 2016/11/10
*
* @brief Main body of the project.
*
* @copyright Copyright (c) 2012-2016 RedBearLab
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
* FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
****************************************************************************/

/****************************************************************************
*                HEADER FILES
****************************************************************************/
#include "wiring_buffer.h"

/****************************************************************************
*                MACRO DEFINITIONS
****************************************************************************/


/****************************************************************************
*                GLOBAL VARIABLES
****************************************************************************/


/****************************************************************************
*                LOCAL VARIABLES
****************************************************************************/


/****************************************************************************
*                LOCAL FUNCTION PROTOTYPES
****************************************************************************/


/****************************************************************************
*                FUNCTION ACHIEVMENT
****************************************************************************/

void Ring_Buffer::store( uint8_t c)
{
    uint16_t i = (( head +1 ) % RING_BUFFER_MAX_SIZE);

    if( i != tail )
    {   // Store
        ring_buffer[head] = c;
        head = i;
    }
}

uint16_t Ring_Buffer::available()
{
    return ((RING_BUFFER_MAX_SIZE + head - tail) % RING_BUFFER_MAX_SIZE);
}

uint8_t Ring_Buffer::read(void)
{
    uint8_t dat;

    if(head == tail)
        return -1;

    dat = ring_buffer[tail];
    tail = (tail + 1) % RING_BUFFER_MAX_SIZE;

    return dat;
}

uint8_t Ring_Buffer::peek(void)
{
    if(head == tail)
        return -1;

    return ring_buffer[tail];
}

void Ring_Buffer::clear(void)
{
    memset(ring_buffer, 0, RING_BUFFER_MAX_SIZE);
    head = 0;
    tail = 0;
}

bool Ring_Buffer::isFull(void)
{
    uint16_t next_index = ((head + 1) % RING_BUFFER_MAX_SIZE);
    return (next_index == tail);
}

/****************************************************************************
*                END OF FILE
****************************************************************************/
